Genetic structure of cyclic parthenogenetic zooplankton populations – a conceptual framework

Meester, Luc De; Vanoverbeke, Joost; Gelas, Koen De; Ortells, Raquel; Spaak, Piet

doi:10.1127/0003-9136/2006/0167-0217

Cited by 75 publications

(143 citation statements)

References 0 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…The significant regression of SA on CD when correcting for H e indicates that the reduced CD in smaller ponds is not only the result of a lower allelic diversity but that there is also a direct effect of SA on CD. When recruiting from the egg bank at the start of the growing season, even in very small populations hundreds to thousands of clones will hatch simultaneously (De Meester et al, 2006) and the genetic composition of the hatchlings will be in close agreement with H-W expectations. This is, for example, evident from the observation of high clonal diversity in some of the populations from small ponds that were sampled shortly after the onset of the growing season.…”

Section: Discussionsupporting

confidence: 53%

“…Differences among these three types of water bodies can be expressed in terms of length of the parthenogenetic phase and size of the habitat (De Meester et al, 2006). Although the effect of duration of the growing season (parthenogenetic reproduction) on the genetic composition of cyclical parthenogenetic populations is easily appreciated when comparing, for example, intermittent and permanent pond populations, size of the habitat has never been looked at explicitly.…”

Section: Introductionmentioning

confidence: 99%

“…First, although even in small ponds hundreds to thousands of clones will hatch from the egg bank at the beginning of the growing season (De Meester et al, 2006), smaller ponds are expected to have a smaller stock of dormant eggs and hence to have a lower total recruitment of clones from the dormant egg bank. Second, small ponds harbour smaller populations than large lakes, making a population with an equal diversity of clones more vulnerable to extinction of clones, as each clone will be represented by fewer individuals.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Habitat size and the genetic structure of a cyclical parthenogen, Daphnia magna

2007

View full text Add to dashboard Cite

In populations of a cyclical parthenogen, the diversity of clonal lineages, derived from sexually produced eggs, declines during the parthenogenetic phase. Even though Daphnia magna populations from small ponds may harbour millions of individuals, we show that observed clonal and allelic diversity in populations from such small water bodies are lower than in populations from larger water bodies. Populations from small water bodies also show significant fluctuations in allele frequencies among years and a stronger among-population genetic differentiation than populations inhabiting larger water bodies. Persistent founder effects can only explain part of these results. Our data link the population genetic structure of cyclical parthenogens to the size of the habitat and suggest that genetic drift is a more prominent feature of populations inhabiting small water bodies than previously thought.

show abstract

Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Habitat size and the genetic structure of a cyclical parthenogen, Daphnia magna

2007

View full text Add to dashboard Cite

show abstract

“…The results of our study suggest that these approaches might indeed be feasible in Daphnia. Genetic differentiation among Daphnia populations can be strong (e.g., Hebert 1978;Lynch and Spitze 1994;De Meester et al 2006). Population subdivision can contribute to high continentwide diversity (Whitlock and Barton 1997;Pannell and Charlesworth 2000;Wakeley 2000), but should also decrease recombination (Nordborg 2000;Wakeley and Aliacar 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Allozyme studies have already shown that Daphnia can have considerable genetic diversity, both within and between populations (e.g., Hebert 1978;Lynch and Spitze 1994;De Meester et al 2006). However, data on nucleotide diversity are needed to estimate silent and synonymous diversity, which are likely to be neutral or weakly selected, so as to estimate N e .…”

mentioning

confidence: 99%

Nucleotide Polymorphism and Within-Gene Recombination in Daphnia magna and D. pulex, Two Cyclical Parthenogens

et al. 2009

View full text Add to dashboard Cite

Theory predicts that partially asexual organisms may make the ''best of both worlds'': for the most part, they avoid the costs of sexual reproduction, while still benefiting from an enhanced efficiency of selection compared to obligately asexual organisms. There is, however, little empirical data on partially asexual organisms to test this prediction. Here we examine patterns of nucleotide diversity at eight nuclear loci in continentwide samples of two species of cyclically parthenogenetic Daphnia to assess the effect of partial asexual reproduction on effective population size and amount of recombination. Both species have high nucleotide diversities and show abundant evidence for recombination, yielding large estimates of effective population sizes (300,000-600,000). This suggests that selection will act efficiently even on mutations with small selection coefficients. Divergence between the two species is less than one-tenth of previous estimates, which were derived using a mitochondrial molecular clock. As the two species investigated are among the most distantly related species of the genus, this suggests that the genus Daphnia may be considerably younger than previously thought. Daphnia has recently received increased attention because it is being developed as a model organism for ecological and evolutionary genomics. Our results confirm the attractiveness of Daphnia as a model organism, because the high nucleotide diversity and low linkage disequilibrium suggest that fine-scale mapping of genes affecting phenotypes through association studies should be feasible.

show abstract

Seasonal variation of genotypes and reproductive plasticity in a facultative clonal freshwater invertebrate animal (Hydra oligactis) living in a temperate lake

Miklós

Laczkó

Sramkó

et al. 2022

Ecology and Evolution

View full text Add to dashboard Cite

Facultative sexual organisms combine sexual and asexual reproduction within a single life cycle, often switching between reproductive modes depending on environmental conditions. These organisms frequently inhabit variable seasonal environments, where favorable periods alternate with unfavorable periods, generating temporally varying selection pressures that strongly influence life history decisions and hence population dynamics. Due to the rapidly accelerating changes in our global environment today, understanding the population dynamics and genetic changes in facultative sexual populations inhabiting seasonal environments is critical to assess and prepare for additional challenges that will affect such ecosystems. In this study, we aimed at obtaining insights into the seasonal population dynamics of the facultative sexual freshwater cnidarian Hydra oligactis through a combination of restriction site‐associated sequencing (RAD‐Seq) genotyping and the collection of phenotypic data on the reproductive strategy of field‐collected hydra strains in a standard laboratory environment. We reliably detected 42 MlGs from the 121 collected hydra strains. Most of MLGs (N = 35, 83.3%) were detected in only one season. Five MLGs (11.9%) were detected in two seasons, one (2.4%) in three seasons and one (2.4%) in all four seasons. We found no significant genetic change during the 2 years in the study population. Clone lines were detected between seasons and even years, suggesting that clonal lineages can persist for a long time in a natural population. We also found that distinct genotypes differ in sexual reproduction frequency, but these differences did not affect whether genotypes reappeared across samplings. Our study provides key insights into the biology of natural hydra populations, while also contributing to understanding the population biology of facultative sexual species inhabiting freshwater ecosystems.

show abstract

Genetic structure of cyclic parthenogenetic zooplankton populations – a conceptual framework

Cited by 75 publications

References 0 publications

Habitat size and the genetic structure of a cyclical parthenogen, Daphnia magna

Habitat size and the genetic structure of a cyclical parthenogen, Daphnia magna

Nucleotide Polymorphism and Within-Gene Recombination in Daphnia magna and D. pulex, Two Cyclical Parthenogens

Seasonal variation of genotypes and reproductive plasticity in a facultative clonal freshwater invertebrate animal (Hydra oligactis) living in a temperate lake

Contact Info

Product

Resources

About